there are sooooooo many choices now.
you best bet is to try friends or if vape shops in ur area allow testing of hardware(maybe) and juices(they should).
but u also need the right juice for "you".
juice meaning flavor, nic, vg/pg ratio, and there are too many juice companys to choose from.
some people try many combos of hardware and juice b4 they can actually quit smoking, so never give up , never surrender.